CHEN Ting ¹, ZHAO Hailei ², XIE Zhixiang ³, JINAG Weihui⁴

(1. School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)

Abstract:The electrically conductive phase PrBaCo2O5+δ was coated on the surface of the ion conductive phase Ce0.8Sm0.2O2-δ by a liquid coating strategy. After sintering, a novel Ce0.8Sm0.2O2-δ–PrBaCo2O5+δ (SDC–PBCO) dual-phase oxygen permeation membrane was achieved.The phase composition, the microstructure, the electrical conductivity and the oxygen permeability of the dual-phase membrane were studied by XRD, SEM, four-terminal DC method and vertical high-temperature gas permeation cell, respectively. The results indicate that the two phases have homogeneous distribution. On the premise of forming percolative network, compared with the conventional ceramic route, its electronic phase threshold volume percentage is decreased from 40 wt.% to 30 wt.%, resulting in the high permeability.

Key words:ceramic membrane; oxygen separation; mixed-conductor; coating; dual-phase